From patchwork Tue Jul 10 22:24:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 942272 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 41QGw02wtYz9s2g for ; Wed, 11 Jul 2018 08:24:32 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732332AbeGJWZj (ORCPT ); Tue, 10 Jul 2018 18:25:39 -0400 Received: from sauhun.de ([88.99.104.3]:45918 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732334AbeGJWZj (ORCPT ); Tue, 10 Jul 2018 18:25:39 -0400 Received: from localhost (p54B33462.dip0.t-ipconnect.de [84.179.52.98]) by pokefinder.org (Postfix) with ESMTPSA id 82B8B56A488; Wed, 11 Jul 2018 00:24:29 +0200 (CEST) From: Wolfram Sang To: linux-i2c@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Yoshihiro Shimoda , Wolfram Sang Subject: [PATCH 2/2] i2c: rcar: use the new get_bus_free callback Date: Wed, 11 Jul 2018 00:24:23 +0200 Message-Id: <20180710222423.7792-3-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180710222423.7792-1-wsa+renesas@sang-engineering.com> References: <20180710222423.7792-1-wsa+renesas@sang-engineering.com> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org To break out of recovery as early as possible, feed back the bus_free logic state. Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-rcar.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 5e310efd9446..76154747971e 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -179,8 +179,6 @@ static void rcar_i2c_set_scl(struct i2c_adapter *adap, int val) rcar_i2c_write(priv, ICMCR, priv->recovery_icmcr); }; -/* No get_sda, because the HW only reports its bus free logic, not SDA itself */ - static void rcar_i2c_set_sda(struct i2c_adapter *adap, int val) { struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); @@ -193,10 +191,19 @@ static void rcar_i2c_set_sda(struct i2c_adapter *adap, int val) rcar_i2c_write(priv, ICMCR, priv->recovery_icmcr); }; +static int rcar_i2c_get_bus_free(struct i2c_adapter *adap) +{ + struct rcar_i2c_priv *priv = i2c_get_adapdata(adap); + + return !(rcar_i2c_read(priv, ICMCR) & FSDA); + +}; + static struct i2c_bus_recovery_info rcar_i2c_bri = { .get_scl = rcar_i2c_get_scl, .set_scl = rcar_i2c_set_scl, .set_sda = rcar_i2c_set_sda, + .get_bus_free = rcar_i2c_get_bus_free, .recover_bus = i2c_generic_scl_recovery, }; static void rcar_i2c_init(struct rcar_i2c_priv *priv) @@ -211,7 +218,7 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv) static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) { - int i, ret; + int i; for (i = 0; i < LOOP_TIMEOUT; i++) { /* make sure that bus is not busy */ @@ -222,13 +229,7 @@ static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv) /* Waiting did not help, try to recover */ priv->recovery_icmcr = MDBS | OBPC | FSDA | FSCL; - ret = i2c_recover_bus(&priv->adap); - - /* No failure when recovering, so check bus busy bit again */ - if (ret == 0) - ret = (rcar_i2c_read(priv, ICMCR) & FSDA) ? -EBUSY : 0; - - return ret; + return i2c_recover_bus(&priv->adap); } static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv, struct i2c_timings *t)